南黄海盆地北部凹陷上白垩统泰州组沉积特征分析

Sedimentary Facies of Taizhou Formation,Upper Cretaceous in North Sag,South Yellow Sea Basin

南黄海盆地位于苏北—南黄海盆地的海域部分。南黄海盆地北部凹陷泰州组发育扇三角洲、滨浅湖、半深—深湖等沉积相类型,其中扇三角洲继承性发育于凹陷北部,在泰一段更为发育。中部深洼带泰二段的一套半深湖—深湖相含灰质泥岩是有利的烃源岩,同时也是良好的盖层,其与泰一段扇三角洲砂岩可形成良好的生储盖组合。

Tile South Yellow Sea Basin is an offshore extension of onshore Subei Bain. Taizhou Formation in North Sag, South Yellow Sea develops fan delta, shore -shallow lacustrine and semi-deep and deep lacustrine facies. Fan delta facies successively develops in north parts of North Sag and develops better in Member 1. The semi - deep and deep lacustrine calcareous mudstones of Member 2 in the entral deep part of North Sag are potential hy- drocarbon source rock and nice caprock. These calcareous mudstones and the fan delta sandstones in member 1 can form favrable source- reservoir- cap combination.